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Maybe this

I was reading on this and I think I could make a very similar set up using this http://www.amazon.com/Marine-Metal-P...d_sim_sbs_sg_6 . It is intended for aeration, so I would think long periods of use should not hurt it, and this would not be a critical health/safety system so I think the savings are justified. I will have to be able to install my own wiring/tubing/fittings/vents but this is something I am capable of. I think the benefits would be obvious (lack of smell) and appreciated. Have any of you tried a "diy" for this application. I would like to know how it worked out/pictures/drawings.

Tony is right that Peggy retired. I should have used past tense when I mentioned what she had said. If memory serves, she also said that Groco went through some 5 years of the trial and error that companies call research and development before they created a tube that disperses bubbles in the tank but doesn't clog. I also think I remember that Groco promptly patented their tubing design. I guess that's what you're buying when you pay the high price for their system. But there is nothing wrong with a little trial and error of your own so long as you have a big enough vent to keep your tank from exploding when you pump air into it. You might have good enough tank access that you could use one of those little air stones like you see in an aquarium and just replace it every trip. Even going without anything to disperse bubbles should be better than no pump at all. If an air pump if for you, I would give it a try.

I bought the Groco system and returned it before installing it. I didn't like the fact that the PVC fitting doesn't pass all the way through the Uniseal, which made it very easy to knock the fitting off. This wouldn't have concerned me if I were installing it in the top of the holding tank, but due to height restrictions I would have had to install it in the side of the tank. If the fitting came loose for any reason on the side of the tank, the result would be BAD.

Other than that it seemed to be pretty well made. I spoke to someone at Groco and he said their original prototype is still running after 10yrs, so the pumps are built to go the distance.